You didn't mention a "Check Engine" light. Is it on? A
disconnected vacuum hose on the regulator would cause the
fuel pressure to rise (low vacuum=high load=high fuel
pressure requirement). I would want to look at the data
stream. Particularly at the Long term Fuel Trim (both banks)
and the Mass Airflow Sensor (MAF) readings. Could be a fuel
pump problem but not likely a regulator concern. The Fuel
Pressure Regulator on this vehicle also measures the fuel
pressure and temperature. A good scan tool will tell you what
you need to diagnose this one. You can compare the fuel
pressure reading to the fuel pump duty cycle to see if the
pump's doing it's thing. (P.S. - I see "dusted" MAF sensors all
the time in our fleet of Police Interceptors. I don't try to clean
them anymore - I just change it out if it's bad) I've
experienced one other concern with this one and hopefully,
it's not your concern too - the engine harness from the
processor to the engine can have a break in the 5 volt
reference wire just behind the left valve cover. I've seen a
couple of these now. Not many, thankfully.

Check fuel pressure. Should be 35-40 psi under most driving
conditions. These are returnless systems; as such they do not
have a fuel pressure regulator. There is a fuel pressure sensor,
which provides data the PCM uses to regulate fuel pump voltage
through a fuel pump driver module.
Chances are, you are getting a P0191 / P0148 and have low
pressure. I'd check the fuel pump.

I suspect there may have been bad fuel added. Not long after refueling my check engine light came on. After refueling again and adding fuel cleaner i experenced low power while driving on the intersta...

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